git.sur5r.net Git - openldap/blob - servers/slapd/back-ldap/bind.c

   1 /* bind.c - ldap backend bind function */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
   5  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   6  */
   7 /* This is an altered version */
   8 /*
   9  * Copyright 1999, Howard Chu, All rights reserved. <hyc@highlandsun.com>
  10  *
  11  * Permission is granted to anyone to use this software for any purpose
  12  * on any computer system, and to alter it and redistribute it, subject
  13  * to the following restrictions:
  14  *
  15  * 1. The author is not responsible for the consequences of use of this
  16  *    software, no matter how awful, even if they arise from flaws in it.
  17  *
  18  * 2. The origin of this software must not be misrepresented, either by
  19  *    explicit claim or by omission.  Since few users ever read sources,
  20  *    credits should appear in the documentation.
  21  *
  22  * 3. Altered versions must be plainly marked as such, and must not be
  23  *    misrepresented as being the original software.  Since few users
  24  *    ever read sources, credits should appear in the documentation.
  25  *
  26  * 4. This notice may not be removed or altered.
  27  *
  28  *
  29  *
  30  * Copyright 2000, Pierangelo Masarati, All rights reserved. <ando@sys-net.it>
  31  *
  32  * This software is being modified by Pierangelo Masarati.
  33  * The previously reported conditions apply to the modified code as well.
  34  * Changes in the original code are highlighted where required.
  35  * Credits for the original code go to the author, Howard Chu.
  36  */
  37
  38 #include "portable.h"
  39
  40 #include <stdio.h>
  41
  42 #include <ac/socket.h>
  43 #include <ac/string.h>
  44
  45
  46 #define AVL_INTERNAL
  47 #include "slap.h"
  48 #include "back-ldap.h"
  49
  50 #define PRINT_CONNTREE 0
  51
  52 static LDAP_REBIND_PROC ldap_back_rebind;
  53
  54 int
  55 ldap_back_bind(
  56     Operation           *op,
  57     SlapReply           *rs )
  58 {
  59         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  60         struct ldapconn *lc;
  61
  62         struct berval mdn = { 0, NULL };
  63         int rc = 0;
  64         ber_int_t msgid;
  65
  66         lc = ldap_back_getconn(op, rs);
  67         if ( !lc ) {
  68                 return( -1 );
  69         }
  70
  71         /*
  72          * Rewrite the bind dn if needed
  73          */
  74 #ifdef ENABLE_REWRITE
  75         switch ( rewrite_session( li->rwinfo, "bindDn",
  76                                 op->o_req_dn.bv_val,
  77                                 op->o_conn, &mdn.bv_val ) ) {
  78         case REWRITE_REGEXEC_OK:
  79                 if ( mdn.bv_val == NULL ) {
  80                         mdn = op->o_req_dn;
  81                 } else {
  82                         mdn.bv_len = strlen( mdn.bv_val );
  83                 }
  84
  85 #ifdef NEW_LOGGING
  86                 LDAP_LOG( BACK_LDAP, DETAIL1,
  87                                 "[rw] bindDn: \"%s\" -> \"%s\"\n",
  88                                 op->o_req_dn.bv_val, mdn.bv_val, 0 );
  89 #else /* !NEW_LOGGING */
  90                 Debug( LDAP_DEBUG_ARGS, "rw> bindDn: \"%s\" -> \"%s\"\n",
  91                                 op->o_req_dn.bv_val, mdn.bv_val, 0 );
  92 #endif /* !NEW_LOGGING */
  93                 break;
  94
  95         case REWRITE_REGEXEC_UNWILLING:
  96                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
  97                                 "Operation not allowed" );
  98                 return( -1 );
  99
 100         case REWRITE_REGEXEC_ERR:
 101                 send_ldap_error( op, rs, LDAP_OTHER,
 102                                 "Rewrite error" );
 103                 return( -1 );
 104         }
 105 #else /* !ENABLE_REWRITE */
 106         ldap_back_dn_massage( li, &op->o_req_dn, &mdn, 0, 1 );
 107 #endif /* !ENABLE_REWRITE */
 108
 109         if ( lc->bound_dn.bv_val ) {
 110                 ch_free( lc->bound_dn.bv_val );
 111                 lc->bound_dn.bv_len = 0;
 112                 lc->bound_dn.bv_val = NULL;
 113         }
 114         lc->bound = 0;
 115         /* method is always LDAP_AUTH_SIMPLE if we got here */
 116         rc = ldap_sasl_bind(lc->ld, mdn.bv_val, LDAP_SASL_SIMPLE,
 117                 &op->oq_bind.rb_cred, op->o_ctrls, NULL, &msgid);
 118         rc = ldap_back_op_result( li, lc, op, rs, msgid, rc, 1 );
 119         if (rc == LDAP_SUCCESS) {
 120                 lc->bound = 1;
 121                 if ( mdn.bv_val != op->o_req_dn.bv_val ) {
 122                         lc->bound_dn = mdn;
 123                 } else {
 124                         ber_dupbv( &lc->bound_dn, &op->o_req_dn );
 125                 }
 126                 if ( li->savecred ) {
 127                         if ( lc->cred.bv_val )
 128                                 ch_free( lc->cred.bv_val );
 129                         ber_dupbv( &lc->cred, &op->oq_bind.rb_cred );
 130                         ldap_set_rebind_proc( lc->ld, ldap_back_rebind, lc );
 131                 }
 132         }
 133
 134         /* must re-insert if local DN changed as result of bind */
 135         if ( lc->bound && !bvmatch(&op->o_req_ndn, &lc->local_dn ) ) {
 136                 int lerr;
 137
 138                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 139                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 140                                 ldap_back_conn_cmp );
 141                 if ( lc->local_dn.bv_val )
 142                         ch_free( lc->local_dn.bv_val );
 143                 ber_dupbv( &lc->local_dn, &op->o_req_ndn );
 144                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 145                         ldap_back_conn_cmp, ldap_back_conn_dup );
 146                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 147                 if ( lerr == -1 ) {
 148                         ldap_back_conn_free( lc );
 149                 }
 150         }
 151
 152         return( rc );
 153 }
 154
 155 /*
 156  * ldap_back_conn_cmp
 157  *
 158  * compares two struct ldapconn based on the value of the conn pointer;
 159  * used by avl stuff
 160  */
 161 int
 162 ldap_back_conn_cmp(
 163         const void *c1,
 164         const void *c2
 165         )
 166 {
 167         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 168         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 169         int rc;
 170
 171         /* If local DNs don't match, it is definitely not a match */
 172         if ( ( rc = ber_bvcmp( &lc1->local_dn, &lc2->local_dn )) )
 173                 return rc;
 174
 175         /* For shared sessions, conn is NULL. Only explicitly
 176          * bound sessions will have non-NULL conn.
 177          */
 178         return lc1->conn - lc2->conn;
 179 }
 180
 181 /*
 182  * ldap_back_conn_dup
 183  *
 184  * returns -1 in case a duplicate struct ldapconn has been inserted;
 185  * used by avl stuff
 186  */
 187 int
 188 ldap_back_conn_dup(
 189         void *c1,
 190         void *c2
 191         )
 192 {
 193         struct ldapconn *lc1 = (struct ldapconn *)c1;
 194         struct ldapconn *lc2 = (struct ldapconn *)c2;
 195
 196         /* Cannot have more than one shared session with same DN */
 197         if ( dn_match( &lc1->local_dn, &lc2->local_dn ) &&
 198                  lc1->conn == lc2->conn ) return -1;
 199
 200         return 0;
 201 }
 202
 203 #if PRINT_CONNTREE > 0
 204 static void ravl_print( Avlnode *root, int depth )
 205 {
 206         int     i;
 207         struct ldapconn *lc;
 208
 209         if ( root == 0 )
 210                 return;
 211
 212         ravl_print( root->avl_right, depth+1 );
 213
 214         for ( i = 0; i < depth; i++ )
 215                 printf( "   " );
 216
 217         lc = root->avl_data;
 218         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 219                         lc, lc->local_dn.bv_val, lc->conn, root->avl_bf );
 220
 221         ravl_print( root->avl_left, depth+1 );
 222 }
 223
 224 static void myprint( Avlnode *root )
 225 {
 226         printf( "********\n" );
 227
 228         if ( root == 0 )
 229                 printf( "\tNULL\n" );
 230
 231         else
 232                 ravl_print( root, 0 );
 233
 234         printf( "********\n" );
 235 }
 236 #endif /* PRINT_CONNTREE */
 237
 238 struct ldapconn *
 239 ldap_back_getconn(Operation *op, SlapReply *rs)
 240 {
 241         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 242         struct ldapconn *lc, lc_curr;
 243         LDAP *ld;
 244         int is_priv = 0;
 245
 246         /*
 247          * The local DN is the op->o_req_ndn if binding, otherwise
 248          * it's the op->o_conn->c_ndn
 249          */
 250         struct berval *cdn      = &op->o_conn->c_ndn;
 251
 252         /* Searches for a ldapconn in the avl tree */
 253
 254         /* Explicit binds must not be shared */
 255         if ( op->o_tag == LDAP_REQ_BIND ) {
 256                 lc_curr.conn = op->o_conn;
 257                 cdn = &op->o_req_ndn;
 258
 259         } else if ( op->o_conn->c_ndn.bv_len ) {
 260                 lc_curr.conn = op->o_conn;
 261
 262         } else {
 263                 lc_curr.conn = NULL;
 264         }
 265
 266         /* Internal searches are privileged. So is root. */
 267         if ( op->o_do_not_cache || be_isroot( li->be, &op->o_ndn ) ) {
 268                 lc_curr.local_dn = li->be->be_rootndn;
 269                 is_priv = 1;
 270         } else {
 271                 lc_curr.local_dn = *cdn;
 272         }
 273         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 274         lc = (struct ldapconn *)avl_find( li->conntree,
 275                 (caddr_t)&lc_curr, ldap_back_conn_cmp );
 276         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 277
 278         /* Looks like we didn't get a bind. Open a new session... */
 279         if (!lc) {
 280                 int vers = op->o_conn->c_protocol;
 281                 rs->sr_err = ldap_initialize(&ld, li->url);
 282
 283                 if (rs->sr_err != LDAP_SUCCESS) {
 284                         rs->sr_err = ldap_back_map_result(rs->sr_err);
 285                         rs->sr_text = "ldap_initialize() failed";
 286                         send_ldap_result( op, rs );
 287                         return( NULL );
 288                 }
 289                 /* Set LDAP version. This will always succeed: If the client
 290                  * bound with a particular version, then so can we.
 291                  */
 292                 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION,
 293                                 (const void *)&vers);
 294                 /* FIXME: configurable? */
 295                 ldap_set_option(ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON);
 296
 297                 lc = (struct ldapconn *)ch_malloc(sizeof(struct ldapconn));
 298                 lc->conn = lc_curr.conn;
 299                 lc->ld = ld;
 300                 ber_dupbv( &lc->local_dn, &lc_curr.local_dn );
 301
 302                 if ( is_priv ) {
 303                         ber_dupbv( &lc->cred, &li->bindpw );
 304                 } else {
 305                         lc->cred.bv_len = 0;
 306                         lc->cred.bv_val = NULL;
 307                 }
 308
 309                 ldap_pvt_thread_mutex_init( &lc->lc_mutex );
 310
 311 #ifdef ENABLE_REWRITE
 312                 /*
 313                  * Sets a cookie for the rewrite session
 314                  *
 315                  * FIXME: the o_conn might be no longer valid,
 316                  * since we may have different entries
 317                  * for the same connection
 318                  */
 319                 ( void )rewrite_session_init( li->rwinfo, op->o_conn );
 320 #endif /* ENABLE_REWRITE */
 321
 322                 if ( !is_priv && op->o_conn->c_dn.bv_len != 0 ) {
 323
 324                         /*
 325                          * Rewrite the bind dn if needed
 326                          */
 327 #ifdef ENABLE_REWRITE
 328                         lc->bound_dn.bv_val = NULL;
 329                         lc->bound_dn.bv_len = 0;
 330                         switch ( rewrite_session( li->rwinfo, "bindDn",
 331                                                 op->o_conn->c_dn.bv_val,
 332                                                 op->o_conn,
 333                                                 &lc->bound_dn.bv_val ) ) {
 334                         case REWRITE_REGEXEC_OK:
 335                                 if ( lc->bound_dn.bv_val == NULL ) {
 336                                         ber_dupbv( &lc->bound_dn,
 337                                                         &op->o_conn->c_dn );
 338                                 } else {
 339                                         lc->bound_dn.bv_len = strlen( lc->bound_dn.bv_val );
 340                                 }
 341 #ifdef NEW_LOGGING
 342                                 LDAP_LOG( BACK_LDAP, DETAIL1,
 343                                                 "[rw] bindDn: \"%s\" ->"
 344                                                 " \"%s\"\n",
 345                                                 op->o_conn->c_dn.bv_val,
 346                                                 lc->bound_dn.bv_val, 0 );
 347 #else /* !NEW_LOGGING */
 348                                 Debug( LDAP_DEBUG_ARGS,
 349                                                 "rw> bindDn: \"%s\" ->"
 350                                                 " \"%s\"\n",
 351                                                 op->o_conn->c_dn.bv_val,
 352                                                 lc->bound_dn.bv_val, 0 );
 353 #endif /* !NEW_LOGGING */
 354                                 break;
 355
 356                         case REWRITE_REGEXEC_UNWILLING:
 357                                 send_ldap_error( op, rs,
 358                                                 LDAP_UNWILLING_TO_PERFORM,
 359                                                 "Operation not allowed" );
 360                                 return( NULL );
 361
 362                         case REWRITE_REGEXEC_ERR:
 363                                 send_ldap_error( op, rs,
 364                                                 LDAP_OTHER,
 365                                                 "Rewrite error" );
 366                                 return( NULL );
 367                         }
 368
 369 #else /* !ENABLE_REWRITE */
 370                         struct berval bv;
 371                         ldap_back_dn_massage( li, &op->o_conn->c_dn, &bv, 0, 1 );
 372                         if ( bv.bv_val == op->o_conn->c_dn.bv_val ) {
 373                                 ber_dupbv( &lc->bound_dn, &bv );
 374                         } else {
 375                                 lc->bound_dn = bv;
 376                         }
 377 #endif /* !ENABLE_REWRITE */
 378
 379                 } else {
 380                         lc->bound_dn.bv_val = NULL;
 381                         lc->bound_dn.bv_len = 0;
 382                 }
 383                 lc->bound = 0;
 384
 385                 /* Inserts the newly created ldapconn in the avl tree */
 386                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 387                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 388                         ldap_back_conn_cmp, ldap_back_conn_dup );
 389
 390 #if PRINT_CONNTREE > 0
 391                 myprint( li->conntree );
 392 #endif /* PRINT_CONNTREE */
 393
 394                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 395
 396 #ifdef NEW_LOGGING
 397                 LDAP_LOG( BACK_LDAP, INFO,
 398                         "ldap_back_getconn: conn %lx inserted\n", lc, 0, 0);
 399 #else /* !NEW_LOGGING */
 400                 Debug( LDAP_DEBUG_TRACE,
 401                         "=>ldap_back_getconn: conn %lx inserted\n", lc, 0, 0 );
 402 #endif /* !NEW_LOGGING */
 403
 404                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 405                 if ( rs->sr_err != 0 ) {
 406                         ldap_back_conn_free( lc );
 407                         send_ldap_error( op, rs, LDAP_OTHER,
 408                         "internal server error" );
 409                         return( NULL );
 410                 }
 411         } else {
 412 #ifdef NEW_LOGGING
 413                 LDAP_LOG( BACK_LDAP, INFO,
 414                         "ldap_back_getconn: conn %lx fetched\n",
 415                         lc, 0, 0 );
 416 #else /* !NEW_LOGGING */
 417                 Debug( LDAP_DEBUG_TRACE,
 418                         "=>ldap_back_getconn: conn %lx fetched\n", lc, 0, 0 );
 419 #endif /* !NEW_LOGGING */
 420         }
 421
 422         return( lc );
 423 }
 424
 425 /*
 426  * ldap_back_dobind
 427  *
 428  * Note: as the check for the value of lc->bound was already here, I removed
 429  * it from all the callers, and I made the function return the flag, so
 430  * it can be used to simplify the check.
 431  */
 432 int
 433 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 434 {
 435         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 436         int rc;
 437         ber_int_t msgid;
 438
 439         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 440         if ( !lc->bound ) {
 441                 rc = ldap_sasl_bind(lc->ld, lc->bound_dn.bv_val,
 442                         LDAP_SASL_SIMPLE, &lc->cred, NULL, NULL, &msgid);
 443                 rc = ldap_back_op_result( li, lc, op, rs, msgid, rc, 0 );
 444                 if (rc == LDAP_SUCCESS) {
 445                         lc->bound = 1;
 446                 }
 447         }
 448         rc = lc->bound;
 449         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 450         return rc;
 451 }
 452
 453 /*
 454  * ldap_back_rebind
 455  *
 456  * This is a callback used for chasing referrals using the same
 457  * credentials as the original user on this session.
 458  */
 459 static int
 460 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 461         ber_int_t msgid, void *params )
 462 {
 463         struct ldapconn *lc = params;
 464
 465         return ldap_bind_s( ld, lc->bound_dn.bv_val, lc->cred.bv_val, LDAP_AUTH_SIMPLE );
 466 }
 467
 468 /* Map API errors to protocol errors... */
 469
 470 int
 471 ldap_back_map_result(int err)
 472 {
 473         switch(err)
 474         {
 475         case LDAP_SERVER_DOWN:
 476                 return LDAP_UNAVAILABLE;
 477         case LDAP_LOCAL_ERROR:
 478                 return LDAP_OTHER;
 479         case LDAP_ENCODING_ERROR:
 480         case LDAP_DECODING_ERROR:
 481                 return LDAP_PROTOCOL_ERROR;
 482         case LDAP_TIMEOUT:
 483                 return LDAP_UNAVAILABLE;
 484         case LDAP_AUTH_UNKNOWN:
 485                 return LDAP_AUTH_METHOD_NOT_SUPPORTED;
 486         case LDAP_FILTER_ERROR:
 487                 return LDAP_OTHER;
 488         case LDAP_USER_CANCELLED:
 489                 return LDAP_OTHER;
 490         case LDAP_PARAM_ERROR:
 491                 return LDAP_PROTOCOL_ERROR;
 492         case LDAP_NO_MEMORY:
 493                 return LDAP_OTHER;
 494         case LDAP_CONNECT_ERROR:
 495                 return LDAP_UNAVAILABLE;
 496         case LDAP_NOT_SUPPORTED:
 497                 return LDAP_UNWILLING_TO_PERFORM;
 498         case LDAP_CONTROL_NOT_FOUND:
 499                 return LDAP_PROTOCOL_ERROR;
 500         case LDAP_NO_RESULTS_RETURNED:
 501                 return LDAP_NO_SUCH_OBJECT;
 502         case LDAP_MORE_RESULTS_TO_RETURN:
 503                 return LDAP_OTHER;
 504         case LDAP_CLIENT_LOOP:
 505         case LDAP_REFERRAL_LIMIT_EXCEEDED:
 506                 return LDAP_LOOP_DETECT;
 507         default:
 508                 if LDAP_API_ERROR(err)
 509                         return LDAP_OTHER;
 510                 else
 511                         return err;
 512         }
 513 }
 514
 515 int
 516 ldap_back_op_result(struct ldapinfo *li, struct ldapconn *lc,
 517         Operation *op, SlapReply *rs, ber_int_t msgid, int err, int sendok)
 518 {
 519         char *match = NULL;
 520         LDAPMessage *res;
 521         int rc;
 522
 523         rs->sr_text = NULL;
 524         rs->sr_matched = NULL;
 525
 526         if (err == LDAP_SUCCESS) {
 527                 if (ldap_result(lc->ld, msgid, 1, NULL, &res) == -1) {
 528                         ldap_get_option(lc->ld, LDAP_OPT_ERROR_NUMBER, &err);
 529                 } else {
 530                         rc = ldap_parse_result(lc->ld, res, &err, &match,
 531                                 (char **)&rs->sr_text, NULL, NULL, 1);
 532                         if (rc != LDAP_SUCCESS) err = rc;
 533                 }
 534         }
 535         if (err != LDAP_SUCCESS) {
 536                 err = ldap_back_map_result(err);
 537
 538                 /* internal ops must not reply to client */
 539                 if ( op->o_conn && !op->o_do_not_cache ) {
 540 #ifdef ENABLE_REWRITE
 541                         if (match) {
 542
 543                                 switch(rewrite_session(li->rwinfo, "matchedDn", match, op->o_conn,
 544                                         (char **)&rs->sr_matched)) {
 545                                 case REWRITE_REGEXEC_OK:
 546                                         if (!rs->sr_matched) rs->sr_matched = match; break;
 547                                 case REWRITE_REGEXEC_UNWILLING:
 548                                 case REWRITE_REGEXEC_ERR:
 549                                         break;
 550                                 }
 551                         }
 552 #else
 553                         struct berval dn, mdn;
 554                         if (match) {
 555                                 ber_str2bv(match, 0, 0, &dn);
 556                                 ldap_back_dn_massage(li, &dn, &mdn, 0, 0);
 557                                 rs->sr_matched = mdn.bv_val;
 558                         }
 559 #endif
 560                 }
 561         }
 562         if (sendok || err != LDAP_SUCCESS) {
 563                 rs->sr_err = err;
 564                 send_ldap_result( op, rs );
 565         }
 566         if (rs->sr_matched != match) free((char *)rs->sr_matched);
 567         rs->sr_matched = NULL;
 568         if ( match ) ldap_memfree( match );
 569         if ( rs->sr_text ) {
 570                 ldap_memfree( (char *)rs->sr_text );
 571                 rs->sr_text = NULL;
 572         }
 573         return( (err==LDAP_SUCCESS) ? 0 : -1 );
 574 }
 575